.demo{
  padding: 2em 0;
  transform: translate3d(0, 0, 0);
  margin-top: 180px;
  position: relative;
}
.navbar{
  width: 150px;
  height: 150px;
  line-height: 150px;
  border-radius: 50%;
  background: #fff;
  -webkit-box-shadow:10px 5px 20px #7d7d7d;
     -moz-box-shadow:10px 5px 20px #7d7d7d;
          box-shadow:10px 5px 20px #7d7d7d;
  float:right;
  position: relative;
  cursor: pointer;
  text-align: center;
  font-size: 1.75em;
  font-weight: bold;
  color: #99b977;
  transition: 0.24s 0.2s;
}
.navbar:hover{
  background: rgba(255, 255, 255, 0.75);
}
.navbar .menu{
  list-style: none;
  padding: 0;
  margin: 0;
  position: absolute;
  top: -75px;
  left: -75px;
  border: 150px solid transparent;
  cursor: default;
  border-radius: 50%;
  transform: scale(0);
  transition: transform 1.4s 0.07s;
  z-index: -1;
}
.navbar:hover .menu{
  transition: transform 0.4s 0.08s, z-index   0s  0.5s;
  transform: scale(1);
  z-index: 1;
}
.navbar .menu .menu-list{
  list-style: none;
  position: absolute;
  top: -100px;
  left: -100px;
  transform-origin: 100px 100px;
  transition: all 0.5s 0.1s;
}
.navbar:hover .menu .menu-list{
  transition: all 0.6s;
}
.navbar .menu .menu-list a{
  width: 45px;
  height: 45px;
  line-height: 45px;
  border-radius: 50%;
  background: #fff;
  position: absolute;
  font-size: 60%;
  color: #99b977;
  transition: 0.6s;
}
.menu a{
  color: rgba(255, 255, 255, 0.6);
  outline: none;
  text-decoration: none;
  -webkit-transition: 0.2s;
          transition: 0.2s;
}
.menu a:hover,.menu a:focus{
  color:#74777b;
  text-decoration: none;
}
.navbar:hover .menu .menu-list:nth-child(1){
  transition-delay: 0.02s;
  transform: rotate(85deg);
}
.navbar:hover .menu .menu-list:nth-child(1) a{
  transition-delay: 0.04s;
  transform: rotate(635deg);
  background: url("../imgs/sample_flat_131.png") no-repeat -1px -1px;
  background-size: 45px 45px;
}

.navbar:hover .menu .menu-list:nth-child(1) a:hover .fa-code{
  width: 230px;
  height: 280px;
  display: inline-block;
  position: relative;
  background: url("../imgs/code-weibo.jpg") no-repeat;
  -webkit-box-shadow:10px 5px 20px #7d7d7d;
  -moz-box-shadow:10px 5px 20px #7d7d7d;
  box-shadow:10px 5px 20px #7d7d7d;
  background-size: 230px 280px;
  left:-460px;
  top:-40px;
}

.navbar:hover .menu .menu-list:nth-child(2){
  transition-delay: 0.04s;
  transform: rotate(125deg);
}
.navbar:hover .menu .menu-list:nth-child(2) a{
  transition-delay: 0.08s;
  transform: rotate(595deg);
  background: url("../imgs/sample_flat_136.png") no-repeat -1px -1px;
  background-size: 45px 45px;
}

.navbar:hover .menu .menu-list:nth-child(2) a:hover .fa-code{
  width: 230px;
  height: 280px;
  display: inline-block;
  position: relative;
  background: url("../imgs/code-weixin.jpg") no-repeat;
  -webkit-box-shadow:10px 5px 20px #7d7d7d;
  -moz-box-shadow:10px 5px 20px #7d7d7d;
  box-shadow:10px 5px 20px #7d7d7d;
  background-size: 230px 280px;
  left:-500px;
  top:-100px;
}

.navbar:hover .menu .menu-list:nth-child(3){
  transition-delay: 0.06s;
  transform: rotate(165deg);
}
.navbar:hover .menu .menu-list:nth-child(3) a{
  transition-delay: 0.12s;
  transform: rotate(555deg);
  background: url("../imgs/sample_flat_140.png") no-repeat -1px -1px;
  background-size: 45px 45px;
}

.navbar:hover .menu .menu-list:nth-child(3) a:hover .fa-code{
  width: 230px;
  height: 280px;
  display: inline-block;
  position: relative;
  background: url("../imgs/code-QQ.jpg") no-repeat;
  -webkit-box-shadow:10px 5px 20px #7d7d7d;
  -moz-box-shadow:10px 5px 20px #7d7d7d;
  box-shadow:10px 5px 20px #7d7d7d;
  background-size: 230px 280px;
  left:-490px;
  top:-160px;
}

.navbar:hover .menu .menu-list:nth-child(4){
  transition-delay: 0.08s;
  transform: rotate(205deg);
}
.navbar:hover .menu .menu-list:nth-child(4) a{
  transition-delay: 0.16s;
  transform: rotate(515deg);
  background: url("../imgs/sample_flat_221.png") no-repeat -1px -1px;
  background-size: 45px 45px;
}
.navbar:hover .menu .menu-list:nth-child(5){
  transition-delay: 0.1s;
  transform: rotate(245deg);
}
.navbar:hover .menu .menu-list:nth-child(5) a{
  transition-delay: 0.2s;
  transform: rotate(475deg);
  background: url("../imgs/sample_flat_302.png") no-repeat;
  background-size: 45px 45px;
}
.navbar:hover .menu .menu-list:nth-child(6){
  transition-delay: 0.12s;
  transform: rotate(285deg);
}
.navbar:hover .menu .menu-list:nth-child(6) a{
  transition-delay: 0.24s;
  transform: rotate(435deg);
  background: url("../imgs/sample_flat_79.png")no-repeat -1px -1px;
  background-size: 45px 45px;
}
.navbar:hover .menu .menu-list:nth-child(7){
  transition-delay: 0.14s;
  transform: rotate(325deg);
}
.navbar:hover .menu .menu-list:nth-child(7) a{
  transition-delay: 0.28s;
  transform: rotate(395deg);
  background: url("../imgs/sample_flat_83.png")no-repeat;
  background-size: 45px 45px;
}
.navbar:hover .menu .menu-list:nth-child(8){
  transition-delay: 0.16s;
  transform: rotate(365deg);
}
.navbar:hover .menu .menu-list:nth-child(8) a{
  transition-delay: 0.32s;
  transform: rotate(355deg);
  background: url("../imgs/sample_flat_84.png")no-repeat;
  background-size: 45px 45px;
}
.navbar:hover .menu .menu-list:nth-child(9){
  transition-delay: 0.18s;
  transform: rotate(405deg);
}
.navbar:hover .menu .menu-list:nth-child(9) a{
  transition-delay: 0.36s;
  transform: rotate(315deg);
  background: url("../imgs/app_store_iphone.png")no-repeat;
  background-size: 45px 45px;
}
.navbar:hover .menu .menu-list:nth-child(9) a:hover .fa-code{
  width: 250px;
  height: 310px;
  display: inline-block;
  position: relative;
  background: url("../imgs/code-mingpian.jpg") no-repeat;
  -webkit-box-shadow:10px 5px 20px #7d7d7d;
  -moz-box-shadow:10px 5px 20px #7d7d7d;
  box-shadow:10px 5px 20px #7d7d7d;
  background-size: 250px 310px;
  left:-400px;
  top:-10px;
}